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A kind of high-performance lithium-ion secondary battery negative electrode material Si/C composite material and preparation method thereof

A technology for composite materials and secondary batteries, which is applied in the direction of secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of high cost, troublesome preparation steps, and electrochemical performance to be improved, and achieve low cost and excellent electrochemical performance. Performance, the effect of realizing the effective use of waste

Active Publication Date: 2020-04-14
山东大学深圳研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation steps are cumbersome and the cost is high. The raw material is purchased nano-silica, which needs further processing, and the electrochemical performance needs to be improved.

Method used

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  • A kind of high-performance lithium-ion secondary battery negative electrode material Si/C composite material and preparation method thereof
  • A kind of high-performance lithium-ion secondary battery negative electrode material Si/C composite material and preparation method thereof
  • A kind of high-performance lithium-ion secondary battery negative electrode material Si/C composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A high-performance lithium-ion secondary battery negative electrode material Si / C composite material, the composite material includes a composite of carbon and silicon, the mass content of carbon in the composite is 30%, and the mass content of silicon is 70%; the The microscopic morphology of the composite material is: the surface of the Si nanoparticles is covered with a carbon layer to form a carbon-silicon nanocomposite ball, and is loaded on the surface of the sheet-like carbon; the size of the Si nanoparticles is 20nm, and the carbon layer The thickness is 5nm, and the diameter of the pellet is about 25nm.

[0051] The preparation method of the above-mentioned high-performance lithium-ion secondary battery negative electrode material Si / C composite material comprises the following steps:

[0052] (1) Soak 5 g of bagasse collected in 50 mL of 1mol / L HCl aqueous solution at room temperature for 2 hours to remove inorganic salt impurities, alternately wash with water...

Embodiment 2

[0058] A kind of preparation method of Si / C composite material of anode material of high-performance lithium ion secondary battery, comprises steps as follows:

[0059] (1) Soak 10 g of bagasse collected in 50 mL of 1mol / L HCl aqueous solution at room temperature for 4 hours to remove inorganic salt impurities, alternately wash with water and absolute ethanol three times, and dry in an oven at 90 ° C for 10 h; then , calcined at 650°C in air for 4h, and the heating rate was set at 2°C / min, to obtain white fluffy SiO 2 powder;

[0060] (2) 1g of SiO prepared in step (1) 2 Grind and mix with 1.5g magnesium powder in a mortar and transfer to a porcelain boat, and then quickly transfer to Ar / H 2 (volume ratio 95:5) atmosphere tube furnace, calcined at 600°C for 7h, the heating rate was set at 2°C / min, to obtain the mixture; put the above mixture into 50mL 1mol / L HCl solution (HCl:H 2 (0: molar ratio of dehydrated ethanol=0.66:4.72:8.88) soaked at room temperature for 8 hours, d...

Embodiment 3

[0063] A kind of preparation method of Si / C composite material of anode material of high-performance lithium ion secondary battery, comprises steps as follows:

[0064] (1) Soak 15g of bagasse collected in 50mL of 1mol / L HCl aqueous solution at room temperature for 6 hours to remove inorganic salt impurities, alternately wash with water and absolute ethanol three times respectively, and dry in an oven at 100°C for 8h; then , calcined at 700°C in air for 3h, and the heating rate was set at 5°C / min to obtain white fluffy SiO 2 powder;

[0065] (2) 1g of SiO prepared in step (1) 2 Grind and mix well with 2g magnesium powder in a mortar, transfer to a porcelain boat, and then quickly transfer to Ar / H 2 (volume ratio is 95:5) atmosphere tube furnace, calcined at 700°C for 6.5h, the heating rate was set at 5°C / min, to obtain the mixture; put the above mixture into 50mL 1mol / L HCl solution (HCl:H 2 (0: molar ratio of dehydrated ethanol=0.66:4.72:8.88) soaked at room temperature fo...

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Abstract

The invention provides a high-performance negative electrode material Si / C composite material for lithium ion secondary batteries and a preparation method thereof. The preparation method comprises the following steps: soaking bagasse into an acid solution, washing, drying and calcining in an air atmosphere to obtain SiO2 powder; after grinding and uniformly mixing the SiO2 powder and magnesium powder, calcining in a reducing protective gas atmosphere, soaking in the acid solution and a hydrofluoric acid water solution, then washing and drying to obtain Si nanometer particles; adding the obtained Si nanometer particles into an ascorbic acid water solution, stirring at room temperature, and then stirring at the temperature of 80 to 100 DEG C for 0.5 to 1 h; and calcining in the protective gas atmosphere to obtain the Si / C composite material. The raw materials used in the invention are simple and easily obtained, and the high-performance negative electrode material is green and environmentally-friendly and low in cost and can be produced in large scale; the experimental method is simple and easy to operate, and low in requirement for equipment; and the prepared material is uniform in pore diameter distribution and has excellent electrochemical performance.

Description

technical field [0001] The invention relates to a high-performance lithium-ion secondary battery negative electrode material Si / C composite material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] Silicon is considered to be one of the most promising anode materials because its theoretical specific capacity (4200mA h / g) is more than ten times that of commercial graphite anode (370mA h / g). However, there is a serious problem with silicon anode materials that silicon electrodes undergo considerable volume expansion (up to 300% during electrochemical lithiation) during charge-discharge cycles, leading to cracking and pulverization of the silicon, eventually The capacity of the negative electrode material is rapidly and seriously lost within a few cycles of charging and discharging. [0003] The researchers discovered through exploration that the use of nanostructured silicon can effectively solve the ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 徐立强侯璇
Owner 山东大学深圳研究院
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